TECHNOLOGY has eliminated many of life’s milder physical demands, like getting off the couch to change the channel, or going to the store to buy a book.

The latest exertion to be conquered: biking uphill.

Electric bicycles — a regular pedal-driven bike with a motor for steeper slopes and an optional extra boost — is an idea that has been around for more than a century. But while e-bikes have caught on in certain parts of the world, particularly China, where tens of millions are sold each year, they have never quite captured the imagination of auto-obsessed Americans.

That may be about to change. At the Consumer Electronics Show in Las Vegas this month, Sanyo, the Japanese electronics maker and a major producer of car batteries, showed off a sleek, lightweight e-bike called the Eneloop Hybrid Bicycle.

The Eneloop, priced at $2,300, came to stores in the United States late last year. It operates like any normal bike and, save for the black lithium-ion battery strapped to the frame beneath the seat, looks exactly like one as well. But when you press a button on the left handlebar, a 250-watt motor gently kicks in, providing about twice the power as your own pedaling — and making you feel like Lance Armstrong on even the steepest slopes.

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